Famatinite

Luzonite-Famatinite Series. The synthetic system Cu^3As^xSb^1^-^xS^4 has a two phase region at x = 0.8. Mixtures with x < 0.8 crystallize in the famatinite type, compositions with x > 0.8 crystallize in the enargite type (Pfitzner & Bernert, 2004).

History

Activities related to discovery and approval of the group members

Structural context

Famatinite
Crystal System tetragonalCrystal Class tetragonal scalenohedralSpace Group I-42m
a5.345—5.385 (5.3593)
b5.345—5.385 (5.3593)
c10.63—10.754 (10.6735)
alpha90
beta90
gamma90
volume303.689—311.847 (306.57)

Based on 4 measurements

Chemical context

Stoichiometric formulas

Famatinite
mindat.org
  • March 13, 2023Cu3SbS4
IMA
  • March 13, 2023Cu3SbS4
mineralogy.rocks
  • Aug. 30, 2022Cu1+Cu2+2Sb3+S2-4

Elements recorded on EPMA

4
Cu
4
S
4
Sb
3
As

Physical properties

ColorColor entities, recognized using a custom trained NER model
  • deep pinkish brown
Color noteOriginal color note from the source
Deep pinkish brown
StreakStreak entities, recognized using a custom trained NER model
    Streak noteOriginal streak note from the source
    Black
    Lustre
    Metallic
    Fracture
    Irregular/Uneven
    Conchoidal
    Transparency
    Opaque
    Tenacity
    brittle
    Hardness
    3—4
    Calculated density
    4.66